Hardware Resistor identification

[R3D_Klone]

Hi! I hope everyone is staying healthy and safe!

Long story short, I blew two resistors on my Switch motherboard. It’s the older-style OG model.

Other resistors feel secure, so maybe those two were why I had glitches. I don't know how to assess for more damage in other parts of the motherboard, but I have to start here.

Does anyone know the values of the two resistors I broke off and where they trace? I’m thinking if they are replaced and I still have issues, I’ll need to trace along components replacing things until my Switch is functional again.

Thanks!

Update:

I measured the values using another Switch (same pre-update edition as mine).

The two values are
-8.7 k OHMS
-7.7 k OHMS

I’m concerned I need to retest values again in order find useable parts. The closest value resistance I can find for the 7.7 OHM part is 7.68 1% and 7.8k 1%.
Any guidance on finding parts, values of the resistors, and potentially what circuits run through them in case I have to troubleshoot other parts of the board would be appreciated.

Thanks!

 

[The Real Jdbye]

Update:

I measured the values using another Switch (same pre-update edition as mine).

The two values are
-8.7 k OHMS
-7.7 k OHMS

I’m concerned I need to retest values again in order find useable parts. The closest value resistance I can find for the 7.7 OHM part is 7.68 1% and 7.8k 1%.
Any guidance on finding parts, values of the resistors, and potentially what circuits run through them in case I have to troubleshoot other parts of the board would be appreciated.

Thanks!

7.68 + 0.0768 (1%) = 7.7568 so 7.7k is well within the tolerance for a 7.68k resistor which means that's the correct one to use as the other option is way out of tolerance.

 

[R3D_Klone]

7.68 + 0.0768 (1%) = 7.7568 so 7.7k is well within the tolerance for a 7.68k resistor which means that's the correct one to use as the other option is way out of tolerance.

Unfortunately both resistors are close but neither actually meet the value of the resistor, even if the tolerance is entirely skewed towards the value of the measured resistor.

7.68k: 7.756 at best as you calculated.
7.87k with 1% tolerance: 7.79 at best

I’m not sure how critical the difference would be. If the measured value stays the same next time I measure my sister’s Switch resistors, I’ll like just have to pick on and hope for the best.

 

[The Real Jdbye]

Unfortunately both resistors are close but neither actually meet the value of the resistor, even if the tolerance is entirely skewed towards the value of the measured resistor.

7.68k: 7.756 at best as you calculated.
7.87k with 1% tolerance: 7.79 at best

I’m not sure how critical the difference would be. If the measured value stays the same next time I measure my sister’s Switch resistors, I’ll like just have to pick on and hope for the best.

A 7.68k resistor will never measure exactly 7.68k, that's what the tolerance means. It can measure up to 1% off (higher or lower than the rating) in this case which it's well within. That doesn't guarantee that it's not actually supposed to be 7.7k, but 7.68k is most likely the correct value if it's the closest you can find and it's within the tolerance.

7.7k sounds like it would be a pretty standard value, as it's a nice round number that doesn't need more than 4 digits (first, second, third and number of zeroes) but things may be different for SMD resistors which don't use that system. If you have looked on Digikey and Mouser and can't find an exact 7.7k resistor, you probably aren't gonna find it anywhere. Those sites sell more or less every electronic component under the sun.

Also, since you can't get an exact resistance on a mass produced resistor, unless you buy a lot of them, test them and only use the ones that are perfect, most electronics have to be designed so that it doesn't matter if the resistance is 1% off (or even 5% as the case is with many resistors)
One exception I can think of is maybe high end audio equipment, where a small variance can affect the sound.

Even the resistors Nintendo used will have 1% variance or maybe more, so even if it's not 7.68k they used, some of them are going to measure that or even lower. Unless you can find even lower tolerance resistors.

 

[R3D_Klone]

A 7.68k resistor will never measure exactly 7.68k, that's what the tolerance means. It can measure up to 1% off (higher or lower than the rating) in this case which it's well within. That doesn't guarantee that it's not actually supposed to be 7.7k, but 7.68k is most likely the correct value if it's the closest you can find and it's within the tolerance.

7.7k sounds like it would be a pretty standard value, as it's a nice round number that doesn't need more than 4 digits (first, second, third and number of zeroes) but things may be different for SMD resistors which don't use that system. If you have looked on Digikey and Mouser and can't find an exact 7.7k resistor, you probably aren't gonna find it anywhere. Those sites sell more or less every electronic component under the sun.

Also, since you can't get an exact resistance on a mass produced resistor, unless you buy a lot of them, test them and only use the ones that are perfect, most electronics have to be designed so that it doesn't matter if the resistance is 1% off (or even 5% as the case is with many resistors)
One exception I can think of is maybe high end audio equipment, where a small variance can affect the sound.

Even the resistors Nintendo used will have 1% variance or maybe more, so even if it's not 7.68k they used, some of them are going to measure that or even lower. Unless you can find even lower tolerance resistors.

I looked on digikey and Mouser and those resistor values were the closest I could find. I didn't find any alternative tolerance values above 1%, and, as you suggested, thought Nintendo possibly used resistors with a higher tolerance value that would actually put the resistors in range since 1% tolerance isn't quite enough. If that's the case, I have freedom in which one I pick. I'm just trying to be as particular as possible so I don't end up creating worse issues (assuming other motherboard components are okay, but one head ache at a time).

Thanks!

 

[The Real Jdbye]

I looked on digikey and Mouser and those resistor values were the closest I could find. I didn't find any alternative tolerance values above 1%, and, as you suggested, thought Nintendo possibly used resistors with a higher tolerance value that would actually put the resistors in range since 1% tolerance isn't quite enough. If that's the case, I have freedom in which one I pick. I'm just trying to be as particular as possible so I don't end up creating worse issues (assuming other motherboard components are okay, but one head ache at a time).

Thanks!

According to what you said, (one of) the values is indeed within tolerance for the 7.7k part. That is the one you should use. You didn't mention anything for the 8.7k ohm part though.

 

[R3D_Klone]

According to what you said, (one of) the values is indeed within tolerance for the 7.7k part. That is the one you should use. You didn't mention anything for the 8.7k ohm part though.

Oh derp. Yes. Both 7.68k and 7.8k replacement resistors CAN be in the tolerance for a theoretical 7.7k resistor. My concern was if either replacement skewed further away from the value I wanted to match, but I’ll follow your suggestion of buying several and testing to see who is closest.

The 8.7 I’m not as worried about. There are parts that are easily within range.

 

[The Real Jdbye]

Oh derp. Yes. Both 7.68k and 7.8k replacement resistors CAN be in the tolerance for a theoretical 7.7k resistor. My concern was if either replacement skewed further away from the value I wanted to match, but I’ll follow your suggestion of buying several and testing to see who is closest.

The 8.7 I’m not as worried about. There are parts that are easily within range.

I meant 7.7k is within tolerance for 7.68k, not the other way around.